[TTI] NFC: Change getFPOpCost to return InstructionCost

This patch migrates the TTI cost interfaces to return an InstructionCost.

See this patch for the introduction of the type: https://reviews.llvm.org/D91174
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2020-November/146408.html

Reviewed By: c-rhodes

Differential Revision: https://reviews.llvm.org/D100316

llvm/include/llvm/Analysis/TargetTransformInfo.h

@@ -812,7 +812,7 @@ public:
 
   /// Return the expected cost of supporting the floating point operation
   /// of the specified type.
-  int getFPOpCost(Type *Ty) const;
+  InstructionCost getFPOpCost(Type *Ty) const;
 
   /// Return the expected cost of materializing for the given integer
   /// immediate of the specified type.
@@ -1515,7 +1515,7 @@ public:
   virtual PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) = 0;
   virtual bool haveFastSqrt(Type *Ty) = 0;
   virtual bool isFCmpOrdCheaperThanFCmpZero(Type *Ty) = 0;
-  virtual int getFPOpCost(Type *Ty) = 0;
+  virtual InstructionCost getFPOpCost(Type *Ty) = 0;
   virtual int getIntImmCodeSizeCost(unsigned Opc, unsigned Idx,
                                     const APInt &Imm, Type *Ty) = 0;
   virtual int getIntImmCost(const APInt &Imm, Type *Ty,
@@ -1938,7 +1938,9 @@ public:
     return Impl.isFCmpOrdCheaperThanFCmpZero(Ty);
   }
 
-  int getFPOpCost(Type *Ty) override { return Impl.getFPOpCost(Ty); }
+  InstructionCost getFPOpCost(Type *Ty) override {
+    return Impl.getFPOpCost(Ty);
+  }
 
   int getIntImmCodeSizeCost(unsigned Opc, unsigned Idx, const APInt &Imm,
                             Type *Ty) override {

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

@@ -340,7 +340,7 @@ public:
 
   bool isFCmpOrdCheaperThanFCmpZero(Type *Ty) const { return true; }
 
-  unsigned getFPOpCost(Type *Ty) const {
+  InstructionCost getFPOpCost(Type *Ty) const {
     return TargetTransformInfo::TCC_Basic;
   }
 

llvm/include/llvm/CodeGen/BasicTTIImpl.h

@@ -411,7 +411,7 @@ public:
     return true;
   }
 
-  unsigned getFPOpCost(Type *Ty) {
+  InstructionCost getFPOpCost(Type *Ty) {
     // Check whether FADD is available, as a proxy for floating-point in
     // general.
     const TargetLoweringBase *TLI = getTLI();

llvm/lib/Analysis/TargetTransformInfo.cpp

@@ -531,8 +531,8 @@ bool TargetTransformInfo::isFCmpOrdCheaperThanFCmpZero(Type *Ty) const {
   return TTIImpl->isFCmpOrdCheaperThanFCmpZero(Ty);
 }
 
-int TargetTransformInfo::getFPOpCost(Type *Ty) const {
-  int Cost = TTIImpl->getFPOpCost(Ty);
+InstructionCost TargetTransformInfo::getFPOpCost(Type *Ty) const {
+  InstructionCost Cost = TTIImpl->getFPOpCost(Ty);
   assert(Cost >= 0 && "TTI should not produce negative costs!");
   return Cost;
 }